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... (like us) could have evolved such that pricks and pinches simply caused us to immediate retreat, without any of the complications of experiencing nociception (http://en.wikipedia.org/wiki/Nociception). Or consider sleep; we could have developed such that our sleeping patterns were involuntarily ...

... sends signals that cause the perception of pain in response to potentially damaging stimulus. Nociceptors are the nerve endings responsible for nociception, one of the two types of persistent pain (the other, neuropathic pain, occurs when nerves in the central or peripheral nervous system are ...